Automatic closure anti-blocking glue dropping device and method of using the same

Abstract

The application discloses an automatic sealing and anti-blocking glue dropping device and a use method thereof, and belongs to the glue dropping field. The device comprises a glue storage pipe and a glue dropping head. The glue dropping head is provided with a glue outlet at the front end. A tapered glue outlet chamber is arranged in the glue dropping head. The tapered tip at the front end of the glue outlet chamber is communicated with the glue outlet. The rear end is communicated with the glue storage pipe. A through needle capable of moving forward and backward is arranged in the glue outlet. The through needle and the glue outlet are provided with a first glue outlet gap. A tapered through needle seat is arranged in the glue outlet chamber. The tapered tip at the front end of the through needle seat is connected with the through needle. The rear end and the glue dropping head are provided with a through needle spring in a compressed state. Under the elastic force of the through needle spring, the side wall of the through needle seat is sealed and pressed on the side wall of the glue outlet chamber. The front end of the through needle extends out of the front end of the glue outlet. After the front end of the through needle is pressed into the glue outlet, the side wall of the through needle seat and the side wall of the glue outlet chamber are provided with a second glue outlet gap. The application realizes automatic sealing after glue dropping, and the glue flow is controllable. The device can automatically clean the glue dropping head blockage.

Description

Technical Field

[0001] This invention relates to the field of adhesive dispensing, and in particular to an automatic sealing and anti-clogging dispensing device and its usage method. Background Technology

[0002] Currently, when using solvent-based adhesives to bond materials such as ABS or acrylic, a simple dispensing method using a syringe syringe with a needle is commonly employed. This method has several drawbacks: First, the adhesive flow rate is difficult to control precisely, easily resulting in excessive overflow and contamination of non-bonding areas of the workpiece, affecting aesthetics. Second, during the dispensing process, the needle is prone to clogging due to the adhesion of dissolved materials or other foreign matter, affecting the continuity of operations. Third, solvent-based adhesives are highly volatile; traditional open or non-closed adhesive storage devices can cause the adhesive to evaporate rapidly, increase in viscosity, or even solidify, resulting in waste and equipment damage. Furthermore, conventional methods cannot quickly start or stop the adhesive dispensing as needed and are difficult to adapt to application scenarios with varying adhesive dispensing volumes. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention aims to provide an automatic sealing and anti-clogging dispensing device and its usage method, which realizes automatic sealing after dispensing, and the glue flow is controllable and can automatically clean the dispensing head blockage.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] An automatic sealing and anti-clogging dispensing device includes a glue storage tube and a dispensing head connected to the front end of the glue storage tube, wherein:

[0006] The dispensing head has a dispensing port at its front end, and a conical dispensing chamber is provided inside the dispensing head. The tip of the cone at the front end of the dispensing chamber is connected to the dispensing port, and the rear end of the dispensing chamber is connected to the glue storage tube.

[0007] The glue outlet is provided with a needle that can move along the front-back direction of the glue outlet. There is a set first glue outlet gap between the needle and the glue outlet. The glue outlet chamber is provided with a conical needle seat. The conical structure of the needle seat matches the conical structure of the glue outlet chamber. The tip of the needle seat is connected to the needle.

[0008] A needle spring in a compressed state is provided between the rear end of the needle holder and the dispensing head. Under the elastic force of the needle spring, the side wall of the needle holder is sealed against the side wall of the dispensing chamber, and the front end of the needle extends out of the front end of the dispensing port. When the front end of the needle is pressed into the dispensing port, a second dispensing gap is formed between the side wall of the needle holder and the side wall of the dispensing chamber.

[0009] Furthermore, the rear end of the glue outlet is connected to the front end of the glue storage tube via a glue storage tube connector, and the needle spring is disposed between the rear end of the needle seat and the front end of the glue storage tube connector.

[0010] Furthermore, the dispensing port is a hollow tubular structure, and the dispensing port is movably connected to the front end of the dispensing head, and the distance by which the dispensing port extends beyond the front end of the dispensing head is adjustable.

[0011] Furthermore, a pressurizing device for pressurizing the contents of the glue reservoir is connected to the rear end of the glue reservoir.

[0012] Furthermore, the pressurization device includes an air storage chamber, with a one-way air intake device at the rear end of the air storage chamber for introducing outside air into the air storage chamber, and a one-way air outlet device at the front end of the air storage chamber for expelling air from the air storage chamber and into the rubber storage tube.

[0013] Furthermore, the one-way air intake device includes a pressing rod, the front end of which is located inside the rear part of the air storage chamber, and the pressing rod is movable along the front-rear direction of the air storage chamber;

[0014] The pressing rod is provided with an air inlet that connects the outside world with the air storage chamber. An air inlet one-way plug is provided at the front end of the air inlet. An air inlet plug spring in a compressed state is provided between the front end of the air inlet one-way plug and the front end of the air storage chamber. The air inlet plug spring seals the air inlet one-way plug backward and presses it against the front end of the air inlet.

[0015] Furthermore, the air intake includes a first section at the front end and a second section at the rear end. The first section is arranged along the front-rear direction of the pressing rod, and the second section communicates with the first section and extends through the side direction of the pressing rod.

[0016] Furthermore, the one-way air outlet device includes an air outlet that connects the air storage chamber and the rubber storage tube. The air outlet is equipped with a one-way air outlet plug. A compressed air outlet plug spring is provided at the front end of the one-way air outlet plug, and the air outlet plug spring seals and presses the one-way air outlet plug backward onto the air outlet.

[0017] Furthermore, the air outlet is provided with an air pressure regulating port that communicates with the air outlet. The connection position between the air pressure regulating port and the air outlet is located at the front end of the one-way air outlet plug, and an air pressure sealing screw is provided on the air pressure regulating port.

[0018] Furthermore, the glue storage tube is provided with a glue volume display window on its side wall, and a removable lighting device is provided on the glue storage tube, the light from which shines on the glue dot at the front end of the dispensing head.

[0019] A method of use, applied to the aforementioned automatic sealing anti-clogging dispensing device, the method of use comprising:

[0020] S1: When glue needs to be dispensed, press the needle at the dispensing point to retract the needle into the glue outlet. The side wall of the needle seat and the side wall of the glue outlet chamber open to form the second glue outlet gap. The glue in the glue outlet chamber passes through the second glue outlet gap and the first glue outlet gap in sequence and flows from the front end of the glue outlet to the dispensing point.

[0021] S2: After the dispensing is completed, the needle is lifted from the dispensing point. Under the elastic force of the needle spring, the side wall of the needle seat is sealed against the side wall of the dispensing chamber, blocking the second dispensing gap, and the glue no longer flows out.

[0022] S3: When it is necessary to pressurize the rubber storage tube, press the pressing rod forward. The pressure in the air storage chamber increases, which overcomes the elastic force of the air outlet plug spring, causing the air outlet one-way plug to open with the air outlet. The air in the air storage chamber enters the rubber storage tube through the air outlet.

[0023] When the pressing rod is released, it moves backward under the elastic force of the air inlet plug spring, the pressure in the air storage chamber decreases, and the pressure of the outside air pushes open the air inlet one-way plug, allowing outside air to enter the air storage chamber through the air inlet.

[0024] S4: When it is not necessary to pressurize the reservoir tube, open the air pressure sealing screw, and outside air can freely enter the reservoir tube through the air pressure regulating port and the air outlet.

[0025] S5: When dispensing illumination is required, the illumination device is snapped onto the glue reservoir tube and adjusted so that the light from the illumination device shines on the dispensing point at the front end of the dispensing head.

[0026] The present invention has the following beneficial effects:

[0027] The dispensing head of this invention has an automatic sealing function. When dispensing is needed, the built-in needle is pressed at the dispensing point, and the adhesive flows out through the gap between the needle and the dispensing head outlet. When the dispensing device is lifted, the needle is pushed out by the built-in needle spring and pressure, blocking the dispensing head outlet and sealing the entire dispensing device space. The dispensing device is normally closed, preventing adhesive evaporation, viscosity increase, and even solidification. Furthermore, the dispensing head of this invention automatically clears blockages, preventing clogging of the dispensing head outlet. The dispensing head outlet has a built-in needle; if external materials dissolve and flow into the outlet during adhesive bonding, or if other external substances block the outlet, pushing the needle removes the foreign matter and prevents clogging. Moreover, the dispensing head of this invention has a function of quickly blocking adhesive flow, preventing unwanted adhesive from flowing out and achieving precise control. When the amount of glue meets the requirements during the dispensing process, lifting the dispensing device will allow the glue to be quickly ejected through the needle, sealing the dispensing port and preventing unnecessary self-flow of glue, thus preventing excessive glue from sticking to other places. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the dispensing head of the present invention (dispensing state).

[0029] Figure 2 This is a schematic diagram of the dispensing head of the present invention (in a sealed state).

[0030] Figure 3 This is an enlarged view of the needle and the glue outlet;

[0031] Figure 4 An exploded view of the dispensing head;

[0032] Figure 5 This is a schematic diagram of an adjustable-length glue outlet;

[0033] Figure 6 This is an exploded view of the automatic sealing and anti-clogging dispensing device of the present invention;

[0034] Figure 7 This is a cross-sectional view of the automatic sealing and anti-clogging dispensing device of the present invention;

[0035] Figure 8 This is a schematic diagram of the gas discharge process of the pressurization device;

[0036] Figure 9 This is a schematic diagram of the air intake process of the pressurization device;

[0037] Figure 10 This is a schematic diagram of the adhesive volume display window;

[0038] Figure 11 This is a schematic diagram of a lighting device. Detailed Implementation

[0039] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0040] This invention provides an automatic sealing and anti-clogging dispensing device, such as... Figure 1-11 As shown, it includes a glue reservoir 1 and a dispensing head 2 connected to the front end of the glue reservoir 1, wherein:

[0041] The dispensing head 2 has a dispensing port 3 at its front end, and a conical dispensing chamber 4 is provided inside the dispensing head 2. The cone tip at the front end of the dispensing chamber 4 is connected to the dispensing port 3, and the rear end of the dispensing chamber 4 is connected to the glue storage tube 1.

[0042] The dispensing port 3 is preferably a hollow, thin, round tube with a certain length, located at the front end of the dispensing head 2, forming a pointed dispensing structure. The dispensing chamber 4 is preferably conical, with the tip facing forward, and communicates with the dispensing port 3.

[0043] A needle 5, movable in the front-to-back direction within the glue outlet 3, is provided inside the outlet 3. A first glue outlet gap 6 is provided between the needle 5 and the side wall of the outlet 3, allowing glue to flow out from the outlet 3 and the needle 5. The needle is preferably cylindrical, but can be solid or hollow; this invention is not limited in this respect. The outer diameter of the needle 5 is smaller than the inner diameter of the outlet 3.

[0044] The dispensing chamber 4 is equipped with a conical needle seat 7 with the tip of the cone facing forward. The conical structure of the needle seat 7 matches the conical structure of the dispensing chamber 4, for example, both are conical and have the same or similar cone apex angles. The tip of the needle seat 7 is connected to the needle 5. The needle 5 and the needle seat 7 can move back and forth as a whole.

[0045] A compressed needle spring 8 is provided between the rear end of the needle holder 7 and the dispensing head 2. Under the elastic force of the needle spring 8, the side wall of the needle holder 7 is pressed against the side wall of the dispensing chamber 4, blocking the dispensing chamber 4 from the dispensing port 3, and no glue drips at this time; at this time, the front end of the needle 5 extends out of the front end of the dispensing port 3. When the front end of the needle 5 is pressed into the dispensing port 3, a second dispensing gap 9 is formed between the side wall of the needle holder 7 and the side wall of the dispensing chamber 4. At this time, the glue drips through the second dispensing gap 9 and the first dispensing gap 6.

[0046] The dispensing head of this invention has an automatic sealing function. When dispensing is needed, the built-in needle is pressed at the dispensing point, and the adhesive flows out through the gap between the needle and the dispensing head outlet. When the dispensing device is lifted, the needle is pushed out by the built-in needle spring and pressure, blocking the dispensing head outlet and sealing the entire dispensing device space. The dispensing device is normally closed, preventing adhesive evaporation, viscosity increase, and even solidification. Furthermore, the dispensing head of this invention automatically clears blockages, preventing clogging of the dispensing head outlet. The dispensing head outlet has a built-in needle; if external materials dissolve and flow into the outlet during adhesive bonding, or if other external substances block the outlet, pushing the needle removes the foreign matter and prevents clogging. Moreover, the dispensing head of this invention has a function of quickly blocking adhesive flow, preventing unwanted adhesive from flowing out and achieving precise control. When the amount of glue meets the requirements during the dispensing process, lifting the dispensing device will allow the glue to be quickly ejected through the needle, sealing the dispensing port and preventing unnecessary self-flow of glue, thus preventing excessive glue from sticking to other places.

[0047] In one embodiment, the rear end of the dispensing port 3 is connected to the front end of the dispensing tube 1 via the dispensing tube connector 10, so that the dispensing head can be detached and replaced, and dispensing heads with different diameter dispensing ports can be replaced according to the different dispensing volumes in different applications.

[0048] The needle spring 8 is located between the rear end of the needle holder 7 and the front end of the glue reservoir connector 10, so as to press the needle holder 7 and the needle 5 forward.

[0049] The dispensing port 3 is movably connected to the front end of the dispensing head 2. For example, the front end of the dispensing head 2 has a mounting hole, and the dispensing head 2 is installed in the mounting hole with a slight interference fit. It can move back and forth, so that the distance of the dispensing port 3 extending out of the front end of the dispensing head 2 is adjustable, that is, the length of the dispensing port 3 exposed is adjustable, thereby adapting to different needle protrusion length requirements.

[0050] As an improvement of this embodiment of the invention, a pressurizing device 11 for pressurizing the contents of the glue storage tube 1 is connected to the rear end of the glue storage tube 1. The pressurizing device 11 increases the pressure in the glue storage tube 1, thereby adjusting the glue dispensing speed and flow rate at the glue outlet of the dispensing head.

[0051] Specifically, the pressurization device 11 includes an air storage chamber 12. A one-way air intake device 13 is provided at the rear end of the air storage chamber 12 to allow outside air to enter the air storage chamber 12, and a one-way air outlet device 14 is provided at the front end of the air storage chamber 12 to allow air to exit the air storage chamber 12 and enter the rubber storage pipe 1.

[0052] The one-way air intake device 13 includes a pressing rod 15, the front end of which is located inside the rear of the air storage chamber 12, and the pressing rod 15 is movable in the front-back direction of the air storage chamber 12. To prevent the pressing rod 15 from sliding out of the rear end of the air storage chamber 12, a limit device 16 is provided at the front end of the pressing rod 15 and the rear end of the air storage chamber 12.

[0053] The pressing rod 15 is provided with an air inlet 17 that connects the outside world with the inside of the air storage chamber 12. An air inlet one-way plug 18 is provided at the front end of the air inlet 17. An air inlet plug spring 19 in a compressed state is provided between the front end of the air inlet one-way plug 18 and the front end of the air storage chamber 12. The air inlet plug spring 19 presses the air inlet one-way plug 18 backward to seal it against the front end of the air inlet 17, so as to realize one-way air intake from the outside world to the air storage chamber 12.

[0054] The air inlet 17 includes a first section 20 at the front end and a second section 21 at the rear end. The first section 20 is arranged along the front-rear direction of the pressing rod 15, and the one-way air inlet plug 18 is provided at its outlet. The second section 21 communicates with the first section 21 and extends through the side of the pressing rod 15, allowing air to enter from the side to prevent fingers from blocking the air inlet when pressing.

[0055] The one-way air outlet device 14 includes an air outlet 22, which connects the air storage chamber 12 and the rubber storage tube 1. The air outlet 22 is equipped with an air outlet one-way plug 23. The front end of the air outlet one-way plug 23 is provided with an air outlet plug spring 24 in a compressed state. The air outlet plug spring 24 presses the air outlet one-way plug 23 backward to seal it on the air outlet 22, thereby realizing one-way air outlet from the air storage chamber 12 to the rubber storage tube 1.

[0056] During use, pressing the lever 15 forward increases the pressure in the air chamber 12, pushing the one-way plug 23 forward and creating a gap 25 between the one-way plug 23 and the air outlet 22. Air enters the glue storage tube 1 through this gap. Then, releasing the lever 15 causes the one-way plug 23 to block the air outlet 22 under the force of the plug spring 24. The lever 15 moves backward under the force of the inlet plug spring 19, thus reducing the pressure in the air chamber 12. The pressure of the outside air pushes open the inlet plug 18, creating a gap 26 between the plug 18 and the inlet 17. Outside air enters the air chamber through this gap 26. Repeating this pressing and releasing motion forces air into the glue storage tube 1, increasing the pressure in the storage tube and adjusting the glue dispensing speed and flow rate at the dispensing head.

[0057] As another improvement, an air pressure regulating port 27 is provided on the air outlet 22, which is connected to the air outlet 22. The connection position between the air pressure regulating port 27 and the air outlet 22 is located at the front end of the one-way air outlet plug 23. An air pressure sealing screw 28 is provided on the air pressure regulating port 27.

[0058] When the dispensing is not pressurized, loosen the air pressure sealing screw 28 to balance the air pressure inside the reservoir with the external air pressure, allowing the dispensing outlet to flow freely.

[0059] In this invention, a glue volume display window 29 can be provided on the side wall of the glue storage tube 1 to facilitate viewing the remaining glue volume in the glue storage tube.

[0060] The glue reservoir tube 2 can also be equipped with a snap-on and detachable lighting device 30. Through a snap-on connection, the light from the lighting device 30 illuminates the glue dot at the front end of the dispensing head 2. This adds a front-end focused lighting function to the dispensing machine, making it easier to see the location of the glue dot. The focus lamp head 31 of the lighting device 30 can be finely adjusted to ensure accurate illumination of the glue dot. The lighting device 30 also includes a lighting switch 32; pressing it activates the lighting, and releasing it deactivates it.

[0061] This invention also provides a method of use, which is applied to the automatic sealing and anti-clogging dispensing device of the aforementioned embodiments. The specific method of use includes:

[0062] S1: When glue needs to be dispensed, press the needle 5 at the dispensing point to retract the needle 5 into the glue outlet 3. The side wall of the needle seat 7 and the side wall of the glue outlet chamber 4 open to form a second glue outlet gap 9. The glue in the glue outlet chamber 4 passes through the second glue outlet gap 9 and the first glue outlet gap 6 in sequence and flows from the front end of the glue outlet 3 to the dispensing point to achieve glue dispensing.

[0063] S2: After dispensing is completed, lift the entire dispensing device and lift the needle 5 from the dispensing point. Under the elastic force of the needle spring 8, the side wall of the needle seat 7 is pressed against the side wall of the dispensing chamber 4, blocking the second dispensing gap 9, and the glue no longer flows out, thus achieving automatic sealing.

[0064] S3: When it is necessary to pressurize the rubber storage tube 1, press the pressing rod 15 forward. The pressure in the air storage chamber 12 increases, which overcomes the elastic force of the air outlet plug spring 24, causing the air outlet one-way plug 23 and the air outlet 22 to open. The air in the air storage chamber 12 enters the rubber storage tube 1 through the air outlet 22.

[0065] Release the pressing lever 15. The pressing lever 15 moves backward under the elastic force of the air inlet plug spring 19. The pressure in the air storage chamber 12 decreases. The pressure of the outside air pushes open the air inlet one-way plug 18, allowing outside air to enter the air storage chamber 12 through the air inlet 17.

[0066] S4: When it is not necessary to pressurize the glue storage tube 1, open the air pressure sealing screw 28, and outside air will freely enter the liquid storage tube 1 through the air pressure regulating port 27 and the air outlet 22 to allow free glue dripping.

[0067] S5: When dispensing illumination is required, attach the illumination device 30 to the glue storage tube 1 and adjust it so that the light from the illumination device 30 illuminates the dispensing point at the front end of the dispensing head 2 to achieve dispensing illumination.

[0068] The steps S1 to S5 mentioned above do not indicate a specific order; they are only used to distinguish them. You can choose the steps that need to be performed according to the required working mode.

[0069] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automatic closed drip blocking sealer, characterized by, It includes a glue reservoir and a dispensing head connected to the front end of the glue reservoir, wherein: The dispensing head has a dispensing port at its front end, and a conical dispensing chamber is provided inside the dispensing head. The tip of the cone at the front end of the dispensing chamber is connected to the dispensing port, and the rear end of the dispensing chamber is connected to the glue storage tube. The glue outlet is provided with a needle that can move along the front-back direction of the glue outlet. There is a set first glue outlet gap between the needle and the glue outlet. The glue outlet chamber is provided with a conical needle seat. The conical structure of the needle seat matches the conical structure of the glue outlet chamber. The tip of the needle seat is connected to the needle. A needle spring in a compressed state is provided between the rear end of the needle holder and the dispensing head. Under the elastic force of the needle spring, the side wall of the needle holder is sealed against the side wall of the dispensing chamber, and the front end of the needle extends out of the front end of the dispensing port. When the front end of the needle is pressed into the dispensing port, a second dispensing gap is formed between the side wall of the needle holder and the side wall of the dispensing chamber.

2. The automatic sealing anti-clogging dispensing device according to claim 1, characterized in that, The rear end of the glue outlet is connected to the front end of the glue storage tube via a glue storage tube connector, and the needle spring is disposed between the rear end of the needle seat and the front end of the glue storage tube connector.

3. The automatic sealing anti-clogging dispensing device according to claim 1, characterized in that, The dispensing port is a hollow tubular structure, and the dispensing port is movably connected to the front end of the dispensing head. The distance by which the dispensing port extends beyond the front end of the dispensing head is adjustable.

4. The automatic sealing and anti-clogging dispensing device according to any one of claims 1-3, characterized in that, The rear end of the glue storage tube is connected to a pressurizing device for pressurizing the contents of the glue storage tube.

5. The automatic sealing and anti-clogging dispensing device according to claim 4, characterized in that, The pressurization device includes an air storage chamber, with a one-way air intake device at the rear end of the air storage chamber to allow outside air to enter the air storage chamber, and a one-way air outlet device at the front end of the air storage chamber to allow air to exit the air storage chamber and enter the rubber storage tube.

6. The automatic sealing and anti-clogging dispensing device according to claim 5, characterized in that, The one-way air intake device includes a pressing rod, the front end of which is located inside the rear part of the air storage chamber, and the pressing rod is movable along the front-back direction of the air storage chamber; The pressing rod is provided with an air inlet that connects the outside world with the air storage chamber. An air inlet one-way plug is provided at the front end of the air inlet. An air inlet plug spring in a compressed state is provided between the front end of the air inlet one-way plug and the front end of the air storage chamber. The air inlet plug spring seals the air inlet one-way plug backward and presses it against the front end of the air inlet.

7. The automatic sealing and anti-clogging dispensing device according to claim 6, characterized in that, The air inlet includes a first section at the front end and a second section at the rear end. The first section is arranged along the front-rear direction of the pressing rod, and the second section communicates with the first section and extends through the side of the pressing rod.

8. The automatic sealing and anti-clogging dispensing device according to claim 6, characterized in that, The one-way air outlet device includes an air outlet that connects the air storage chamber and the rubber storage tube. The air outlet is equipped with a one-way air outlet plug. A compressed air outlet plug spring is provided at the front end of the one-way air outlet plug. The air outlet plug spring presses the one-way air outlet plug backward to seal it against the air outlet.

9. The automatic sealing anti-clogging dispensing device according to claim 8, characterized in that, The air outlet is provided with an air pressure regulating port that communicates with the air outlet. The connection position between the air pressure regulating port and the air outlet is located at the front end of the one-way air outlet plug. An air pressure sealing screw is provided on the air pressure regulating port.

10. The automatic sealing anti-clogging dispensing device according to claim 1, characterized in that, The glue storage tube has a glue volume display window on its side wall and a removable lighting device on its side wall. The light from the lighting device illuminates the glue dot at the front end of the dispensing head.

11. A method of use, characterized in that, The automatic sealing and anti-clogging dispensing device according to any one of claims 1-10, the method of use includes: S1: When glue needs to be dispensed, press the needle at the dispensing point to retract the needle into the glue outlet. The side wall of the needle seat and the side wall of the glue outlet chamber open to form the second glue outlet gap. The glue in the glue outlet chamber passes through the second glue outlet gap and the first glue outlet gap in sequence and flows from the front end of the glue outlet to the dispensing point. S2: After the dispensing is completed, the needle is lifted from the dispensing point. Under the elastic force of the needle spring, the side wall of the needle seat is sealed against the side wall of the dispensing chamber, blocking the second dispensing gap, and the glue no longer flows out. S3: When it is necessary to pressurize the rubber storage tube, press the pressing rod forward. The pressure in the air storage chamber increases, which overcomes the elastic force of the air outlet plug spring, causing the air outlet one-way plug to open with the air outlet. The air in the air storage chamber enters the rubber storage tube through the air outlet. When the pressing rod is released, it moves backward under the elastic force of the air inlet plug spring, the pressure in the air storage chamber decreases, and the pressure of the outside air pushes open the air inlet one-way plug, allowing outside air to enter the air storage chamber through the air inlet. S4: When it is not necessary to pressurize the reservoir tube, open the air pressure sealing screw, and outside air can freely enter the reservoir tube through the air pressure regulating port and the air outlet. S5: When dispensing illumination is required, the illumination device is snapped onto the glue reservoir tube and adjusted so that the light from the illumination device shines on the dispensing point at the front end of the dispensing head.

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